Icom IC-T90A manual PH ch 53.900 MHz Transmitting 8V 145 MHz Displayed frequency

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ADJUSTMENT MODE ADJUSTMENTS (Continued)

•The following adjustment must be performed at “ADJUSTMENT MODE”.

•The adjustment channel indicators (PL, DL, PH, DH, PE, DE) need to change from “DH” channel indicator to use “0” or “.” keys.

					MEASUREMENT					ADJUSTMENT
ADJUSTMENT		ADJUSTMENT CONDITION			MEASUREMENT				VALUE	POINT
										POINT

					UNIT	LOCATION				UNIT	ADJUST

OUTPUT	7	• Displayed frequency :			Top	Connect	an	RF	0.5 W	Top	[DIAL]
POWER		(PH ch.)	50.000 MHz		panel	power meter to the				panel
(8V 50 MHz		• Output power		: Low		[ANT] connector.
Low power)		• Transmitting

	8	• Displayed frequency :							0.5 W		[DIAL]
		(PH ch.)	53.900 MHz
		• Transmitting
(8V 145 MHz
(8V 145 MHz	9	• Displayed frequency :			Top	Connect	an	RF	0.5 W	Top	[DIAL]
Low power)		(PH ch.)	144.000 MHz		panel	power meter to the				panel
		• Output power		: Low		[ANT] connector.
		• Transmitting

	10	• Displayed frequency :							0.5 W		[DIAL]
		(PH ch.)	148.000 MHz
		• Transmitting
(8V 440 MHz
(8V 440 MHz	11	• Displayed frequency :			Front	LCD display			DL = “00”	Top	[DIAL]
Low power)		(DL ch.)	440.000 MHz		panel					panel
		• Output power		: Low
		• Transmitting

	12	• Set the channel indicator : “PL”			Side	Connect an amme-			1.1 A		[DIAL]
		• Transmitting			panel	ter between a power
						supply	and	the
						transceiver.

	13	• Set the channel indicator : “DL”			Top	Connect	an	RF	0.5 W		[DIAL]
		• Transmitting			panel	power meter to the
						[ANT] connector.

	14	• Displayed frequency :			Front	LCD display			DL = “00”		[DIAL]
		(DL ch.)	450.000 MHz		panel
		• Output power		: Low
		• Transmitting

	15	• Set the channel indicator : “PL”			Side	Connect an amme-			1.1 A		[DIAL]
		• Transmitting			panel	ter between a power
						supply	and	the
						transceiver.

	16	• Set the channel indicator : “DL”			Top	Connect	an	RF	0.5 W		[DIAL]
		• Transmitting			panel	power meter to the
						[ANT] connector.

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Contents IC-t90a Introduction Ordering PartsRepair Notes Sample OrderTable of Contents Specifications GeneralTransmitter Receiver Frequency MHzWFM WFMInside Views Logic UnitTop view Bottom viewAF Unit RF UnitTop view Bottom view Disassembly Instructions Removing the rear panel Removing the AF unitCircuit Description Receiver Circuits4 1ST Mixer and 1ST if Circuits RF, AF and VCO Units 5 2ND if and Demodulator Circuits AF UnitRF Circuit AF Amplifier Circuit AF Unit Squelch Circuitaf and Logic Units2ND if and Demodulator Circuit Transmitter Circuits PLL Circuits APC Circuit RF UnitGeneral APC CircuitVCO Divider Circuit VCO and RF Units PLL CircuitPower Supply Circuits 2 R3V Switch IC AF Unit IC51Port Allocations Voltage LineCPU Logic Unit IC1 Ctsel DtcsLCD SEG35Adjustment Procedures Operation on the Adjustment ModeOperation on the Output Power Adjustment PreparationConnection JIGAD-92SMA Trimmer Adjustment PLL LockVCO VoltageVCO Unit RF UnitL16 L456 L19Adjustment Mode Adjustments ReferenceDial FrequencyAdjustment Mode Adjustments PH ch 53.900 MHz Transmitting 8V 145 MHz Displayed frequency Connect an amme 45 a Logic Unit R325R365 R326Ctcss Detector CoilTracking AF Unit CP0IC151, pin 12 SD line L151Displayed frequency Connect a DC volt Maximum voltage Adjustment Adjustment Condition Operation MeterSection Parts List Order DescriptionCoil Eljre 3N9Z-F Ceramic ECJ0EB1H681K Connector AXK6S30445P Ceramic ECJ0EC1H060C Encoder Trimmer Tantalum ECST1EY474R Ceramic ECJ0EC1H2R5B Mechanical Parts and Disassembly AccessoriesChassis Parts Logic Unit RF UnitChassis Parts AF Unit VCO UnitSEMI-CONDUCTOR Information Transistors and FetsDiodes NameBoard Layouts TOP ViewMC1 Microphone DUPLogic unit Bottom ViewSP1 SQL PTTRF Unit RF unit AF Unit VCO UnitEXT.SP EXT.MICREMOTO S253S252 Block Diagram Logic UnitChassis Loop LPF HPF Drive BPF ANT FIL AMPVoltage Diagram 11 1 Logic UnitIC5 11 2 RF Unit 2SK347611 3 AF Unit BU4094BCFVURL 32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan